Atomizing nozzle



Sept. 29, 1936. F. HARscH 2,055,864

AToMIzING NozzLE Filled Sept. 19, '1935 v BY MATTO/ EY The strainer 31is conveniently formed of suit-Y ably fine mesh woven wire fabric asindicated by the drawing, the drawing, however, indicating for the sakeof clearness a much coarser mesh fabric than is used. The strainer is orcylindrical form open at its forward end, and closed at its rear end, asby a piece of mesh having a ange which fits within the end of thecylinder and is soldered or otherwise secured in place. The forward endof the screen is connected to an inwardly and outwardly flanged ring 38by which the strainer is secured in position within the body I0. Asshown, the strainer has an outturned flange at its forward end which isclamped between the inwardly extending fiange of the holding ring 38 anda frictionally held clamping ring 39. The outwardly extending flange ofthe holding ring 38 seats on the vforward end of the body l0 and isclamped between the end of the body and the flange J5 of the tip i5 whenthe cap nut is screwed on the body to clarrnyg) these parts together.The cylindrical strainer and the spring 35 are of such relative sizethat the spring fits fairly closely within the strainer so as to holdthe strainer against collapse under the pressure of the infiowing liquideven when the strainer has become very much clogged after long use.

When the device is in use, the oil or other liquid supplied underpressure to the interior of the body i passes through the strainer El?,thence through the passages 28 and through the straining passage 34 tothe channel formed by the groove 33 from which the liquid, still undersubstantially its original pressure, flows through the tangentialgrooves 3i) to the whirl chamber 28 from which it is discharged throughthe orifice i9. The liquid in the whirl chamber 2S because of itsentering the chamber tangentially, has awhirling motion in the chamber,and because of this whirling motion and the pressure in the chamber, asthe liquid leaves the discharge orifice I9 it is immediately atomizedand advances from the orifice in theform of a cone.

As is customary with spray nozzles of the type referred to, thecross-area oi the discharge orifice il is substantially less than theaggregate cross-area of the tangential grooves 3Q, so that while theflow capacity of the grooves is small enough to obtain a ow velocity ofthe streams of liquid issuing tangentially therefrom into the chamber 28sufcient to causes, rapid whirling of the liquid in the chamber, theiraggregate cross-area is enough greater than the cross-area of thedischarge orifice so that the pressure o the liquid in the chamber willbe sufficient to cause the desired forcible discharge of the iidn uidthrough the orifice. For example, for a discharge orifice of about .013inch diameter the tangential grooves 30 may be about .008 inch wide byabout .008 inch deep, and the width between the tip face it? and theplug surface 32 of the annular straining passage may be about .003 inch.

It is sometimes desirable to dispense with the.

cylindrical strainer 31. In order that the nozzle may be used withoutthis strainer, the bore of the body I0 is formed with a shoulder 40 anda conical spring 35a, the rear end of which seats on this shoulder, isprovided, as shown in Fig. 3, to serve in place of the spring 35 of Fig.1 for holding the plug 25 within the recess of the tip. The strainingpassage 3d will then serve to prevent the passing of particles whichmight obstruct the tangential grooves 30, and although this strainingpassage will then require to be cleaned more often than when the nozzleis provided with a strainer such as 3i, it will still operate for longperiods without cleaning unless the oil or other liquid passing throughit is unusually dirty, or, in the case of an oil burner nozzle, there isa more rapid formation of carbon than usual.

i The tip and plug should be made of a suitable hard heat-resistant andcorrosion-resistant material, such as a suitable stainless steel, butthe housing body and cap nut need not be of such special material. g Ihave made these parts of brass, as is customary for the housings ofnozzles of the kind referred to.

It will be seen that the only threaded parts of the new nozzle are thetwo housing members, and that the two parts, the tip and the plug, whichare the only parts which may need to be renewed within the ordinaryuseful life of a nozzle of this kind, require no threading and are ofsuch form as to be comparatively inexpensive to make. It will also beseen that the construction of the nozzle is such that it is very easy toturn the tangentially grooved surface of the plug against the seatingface of the tip for the purpose of grinding off carbon formed on theseating face opposite the tangential flow-directing grooves.

What is claimed is:

l. A spray nozzle, comprising a housing including a body part having anexternally threaded end and a cap nut on said end having a clampingflange and a central opening, a strainer within the housing having a,cylindrical wall of fine wire mesh carried by a holding ring seatedagainst the end. of the housing body, a tip member seated against saidholding ring, the holding ring and the tip member being clamped againstthe end of the housing body by the cap nut, the tip member having acentral recess the walls of which extend first axially and thenconically to an axial discharge orifice, a plug slidably fitting withinthe recess and having its forward end of frusto-conical shape to seatsurface to surface against the conical surface of the tip recess and toprovide a whirl chamber adjacent the discharge orifice and having aplurality of grooves in its conical seating surface for directing liquidtangentially into the whirl chamber, and a helical spring seated withinthe strainer and bearing against the plug to hold the plug seated withinthe tip recess.

Y2. A spray nozzle, comprising a housing, a tip member at the end of thehousing having an axial discharge orifice and an interior conicalsurface extending from the orifice, and a plug member having afrusto-conical end seated surface to surface against the conical surfaceof the tip member and providing a whirl chamber adjacent the dischargeorifice and having a plurality of grooves in its conical seating surfacefor directing liquid tangentially into the whirl chamber and having anannular surface separated from its conical seating surface by an annularchannelforming groove, said annular surface being spaced from thesurface of the tip member to provide an annular straining passage thewidth of which is substantially less than any cross-dimension of saidgrooves.

acogerse t. s. spray nozzle, comprising a housing, a tip member attheend of the housing having an axial discharge orifice and an interiorconical surface extending from the orifice and an interior cylin dricalsurface rearward of the conical surface. and a plug member having acylindrical body part to fit the cylindrical surface of the tip memberand cut away to provide flow passages and having a frusto-conical endseated surface to surface against the conical surface of the tip memberand providing a whirl chamber adjacent the discharge l orifice andhaving a plurality of grooves in its conical seating surface fordirecting liquid tann gentially into the whirl chamber and havingicetween its cylindrical body part and its conical seating surface anannular surface separated from its conical seating surface by an annularchannelforzning groove, said annular surface being spaced from thesurface of the tip member to provide an annular straining passage thewidth-of which is substantially less than any cross-dimension of said.grooves.

e. A spray nozzle, comprising a, housing including a body part having anexternally threaded end and a cap nut on said end having a clamp ingflange and a central opening, a tip member held at the end of thehousing body by the can nut, said tip member having an axial dischargeorifice and an annular surface about the orifice, a plug member havingan annular surface to seat against said annular surface of the tip mem-'her and shaped to provide within said annular surfaces a circularchamber concentric with the discharge orifice, one oi said annulersurfaces having a. plurality of grooves for directing liquidtangentially into said circular chamber, a strainer having a cylindricalwall of fine wire mesh within the housing carried by a holding ringclamped between the tip member and the end of the nous ing body, and ahelical spring within the strainer fitting therein to support thecylindrical wall thereof and reacting between the strainer and the plugmember to hold the plug member seated against said annular surface ofthe tip member.

5. A spray nozzle, comprising a housing, a tip member at the end ci thehousing having-an axial discharge orice, a slidahly mounted plug memberhaving its forward end shaped to form with the wall ofthe tip member awhirl chamber adjacent the discharge orifice and having an annularsurface to seat against an annular surface of the tip member about theWhirl chamber, one of said annular surfacesbeing 'grooved to providepassages for directing liquid tangenetially into the whirl chamber, astrainer having a cylindrioal wall of fine Wire mesh within the housingheld against movement relatively to the tip member, and a helical springWithin the strainer-fitting therein to support the cylindrical wallthereof and serving to hoidthe plug member seated against the conicalsurface of the tip member.

t. A spray nozzle, comprising a housing, a tip member detachahly mountedat the end of the housing having a central recess and an axial dischargeorifice opening from the recess, a plug slidably fitting within the tiprecess and having its forward end shaped to form with the vvallv of thetip recess a whirl chamber adjacent the discharge orice and having anannular surface to seat against en annular surface of the tip recessabout the whirl chamber,'one of said annular surfaces being grooved toprovide passages for directing liquid tangentially into the whirlchamber, the plughaving also a part spaced outwardly from its saidannular surface providing a surface in liquid straining relation with apart of the surface of the tip recess, said last mentioned surfacesbeing separated from the annular surfaces adjacent the Whirl chamber bya chan nel-forming groove from which the liquid enters the grooves whichdirect the liquid tangentially and a spring mounted within the housingand serving to hold the plug seated in the tip recess.

FRANK HARSCH.

